Belt calculator



G. R. FICKERT BELT CALCULATOR Jue 229 `Filed May 26 1922 2 Sheets-Sheet 1 INVENTO? WTNE SES Jn. z2, 1924. G. R. FICKERT BELT CALCULATOR Filed May 26. 2 Sheets-Sheet 2 Rav mr We F. 3 a

wir/.M3853 Patented Jan. 22, 1924.

UNITED STATES PATENT CFFICE.

`GUSTAV RICHARD FICKERT, OF HOBOKEN, NEW JERSEY.

BELT CALCULATOR.

Application filed May 26,

To all whom t may concern.'

Be it known that I, iUs'rAv R. FIGKERT, a citizen of the nited States, and a resident of Hoboken, in the county of Hudson and State of New Jersey, have invented new and useful Improvements in Belt Calculators, of which the following lis a full, clear,- and exact description.

This invention relates to belt calculators.

The general object of this invention is the provision of a simple, accurate and eilicient device for calculating the stretch of known lengths of belting having different factors of stretch` This object is accomplished by providing movable scales `that may be set in a predetermined relation to one another, and associating with the scales trains of gears that ma be selectively interposed between the soa es to rotate one through a certain angle depending on the train of dgears selected when the other scale is rotate This and other objects of the invention will be more clearly understood from the following detailed description and accompanying drawings.

Figure 1 is a top plan view of the calculator;

Figure 2 is a bottom plan view of the calculator; f

Figure 3 is a bottom plan view of the foundation plate carrying the gear wheels;

Figure 4 is a top plan view of the plate shown in Figure 3;

Figure 5 is a bottom plan view of the scale for indicating the length of belt;

Figure 6 is a section along the Figure 1; and

Figure 7 is a side elevation of the calculator in a folded position. j

Referring to Figures 3 and 4 of the abovementioned dra-wings, a foundation plate 10 is shown with a plate 11 mounted thereon. Circular pockets 12 to 21, inclusive, are cut in this plate to receive the gear wheels 22 to 31, inclusive.. The thickness of the plate 11 is equal to 'the thickness of the gears 22 to 31, inclusive. These gears 22 to 31, inclusive, are fixed to shafts 32 to 41., inclusive, respectively. The shafts are rotatabl mounted in the plate 10 and project througli a distance suilicient for mounting gear wheels on the opposite ends from the gear wheels- 22 to 31, inclusive. Gear wheels 42 to 51,'inclusive, are fixed to the shafts 32 to 41, inclusive7 respectively. A slot 62 extends une 6 6,

1922. Serial No. 563,849.

into the plate 11 and in alinement with this slot an opening 75 extends through the plate 10. Opposite the gear wheels openings 52 to 61, inclusive, are provided which extend through thc plate il), as shown in Figures 3 and 4. An opening 76 extends through the center of the plate i() and a hollow shaft 77 having a disk 7S attached thereto projects through this opening. Opposite the openings 52 to 61, inclusive, certain numbers ranging from .07 to .16 are stamped, as shown in Figure 3. These numbers are the factors of stretch for different types of belting.

Referring to Figure 2, a plate 67 ot slightly smaller diameter than the plate 10, provided with an observation opening 68 and a slot 69, is loosely mounted on the lower end of the hollow shaft 77 A button 79 attached to the hollow shaft 77 by means of a screw 80 which makes threaded engagement with an internal thread provided in the hollow shaft serves to retain the plate 67 in position. Attached to the plate 67 by means of a hinge 70 is a plate 71 which is approximately the same diameter as the plate 67. An opening S1 extends through the centre of the plate 71. An annular ring 72 having its outer edge beveled is attached to the upper face ofthe plate 71 by means of screws 73. Rotata-bly mounted on the plate 71 and retained in position by the annular ring 72 is an annular ring 74 having its outer edge formed into teeth, as shown in Figure 1. Referring to Figure 6, a plate 82 of approximately the same diameter as the plate 10 is rotatably mounted on the hollow shaft 77 seating on a projection 84 extending upward from the plate 10. A knob 83 is provided in conjunction with the plate 82 for rotating the same. The lower face of the plate 82 is cut away, as shown in Figure 5, to form an annular ring 85 and on the inner edge of this annular ring teeth are cut. The internal diameter of this annular ring 85 is of such a size that it tits over the gears 42 to 51, inclusive, meshing with the same. Thus upon the operation of the annular ring 85 all of the gears 42 to 51, inclusive7 are op eratcd and through the shafts 32 to 41, the motion is conveyed to the gears 22 to 31, inclusive. The plate 82 is retained in position by a screw 86 which projects through the knob 83 and engages in an internal thread in the hollow shaft 77.

Referring to Figure 1, the plate 82 has a scale 87 for indicating length of belt LTl at the number of equal parts into which the annular ring 74 should be divided the maximum number of feet represented on the plate 82 is multiplied by the greatest factor marked on the plate l0 whichpis .lt inch. rllhe product of these two numbers is 8. rlhis represents the amount of stretch for fifty feet of belt having a factor or stretch'o'f .16 inch per foot and, therefore, is the maximum stretch which will be meas ured bythis calculator by operatingthe 50 through one complete revolution.

yln determining the number of teeth to be provided on the annular ring 7a, on the annularring and the various gears 22 to 8l, inclusive,pand 4t2 to 5l, inclusive, the size of the calculator is of irst'inportance. ln orderto provide a small and compact calculator, as shown in the drawings, thean nular ring Til is provided With ninety-sii?- teeth and the annular ring 85 With eighty` four. ln Working out the ratio of the gears for any particular factor tnese'tyvo annular riiigshave to be considered. Consider the factor .'16, as shown in ligure 3, which is the factor for the gears E24-to e4, located dianietrically opposite. For one revolution ofthelplate 82 to which1 thev annular ring 85 is attached the annular ring 74 will have to make one complete revolution in order to give the accurate'belt stretch. ln determiningthe number of teeth forthe gear 44 a number such as 14- is selected arbitrarily. lhen 84 is to le as 96 is to Working' out this ratio :c `will be found'to equal i6. Therefore, the gear la is provided With fourteen teeth and the gear Qa'with sixteen teeth. The remaining gears are Worked out inalikemanner, an effort beingmade to lzeep the greatest number of teeth provided on 'any gear below about 22. Taking another example, say the factor .10. '.lhe maximum stretch of' fifty feet of belt for this factor is five inches. Then for one revolution of the plate 82 the annular ring Tfr mu'stbe rot-ated through live-eighths of a revolution or through the distance occupied by sixty teeth. rlhe ratio in this case would bet isto 14 as 60 is Ito 5c, lil being the nu1nber of teeth selected for the gear Wheel 5l. lili/'hen this ratio is vvorlred out the number of teeth that should be provided on the gea Wheel 3l is found to be l0. Theremaining gears are Worked Vout in the same manner.

iffiemoe ing e3 in theplate l0, as shown in Figure 2.

ldutton 79 is then tightened, retaining 'the Y plate 6'? in the po. tion to Vwhich it has been adjusted. The ring is now rotated about the axis of the hinge member andthe annular ring Zei associated with the gear 28. rlhis gear and the gear eicl'm'ounted on the same shaft 38 were designed to rotateV the scale 88 in the proper ratio to the scale 50 for'the l'actor .08. lf the length of the belt is 50 feet and the plate 82 is rotated to the left 'through one revolution, as lshown in Figure l, this rotates the scale 88 through half a revolution, as shown in the same figure. Therefore, the stretch for 5() feet ofbelt having a factor of .O8 inch per foot Would be d inches. ln preparing albeit oi this type to operate pulleys, the over-all measurement of which is 5() feet, itvvoull be necessary to cut away 4l inches'of belt.

l would state in conclusion that While the illustrated example constitutesa practical embodiment of my invention, l do not limit myself strictly to the exact details herein illustrated7 since manifestly the same can be considerably varied Without departingfrom the spirit of the invention as defined inthe appended claims.

Claims:

l. VA'belt calculator for determining belt stretch, comprising tvvo movable graduated members adapted to be set in a predetermined relation to one another, one graduated to represent lengths of belt, the other indicating belt stretch for the dift'erent lengths of belt to give the proper tension,l and trains of gears for the dierent factors of Ystretch associated with one of thelm'ovable members and adapted to be selectively associated with the other movable member to operate the belt stretch scale'to indiate belt stretch when the belt-'scale is moved to indicate a length of belt.

A. belt calculator for determining belt stretch, comprising a foundation plate, a disk radially graduated to represent length of belt rotatably mounted on the founda# tion plateI` van annular plate graduated to represent stretch of `belt for the 'different lengths as indicated 'by said ybelt scale rotatably mounted on amember attached to said foundation plate, trains of gears for the different factors of stretch of belt lmountn ilu loo ed on the foundation plate and operated by the operation of the disk graduated to indicate length of belt, and means for selectively associating the annular plate with any train of gears So that upon rotation of the belt scale disk through an angle indicating a length of belt the annular plate will be rotated through an angle indicating the stretch of belt.

3. A belt calculator for determiningbelt stretch, comprising a foundation plate, two circular scales rotatably mounted aociated with the foundation plate.` one graduated to represent length of belt, the other to represent belt stretch for the different lengths of belt, and means carried by the foundation plate adapted to be interposed between the scales to operate the belt stretch scale at the proper rate relative t0 the belt scale to in- 20 dicate belt stretch for different factors when the belt scale is rotated through a certain angle indicating a length of belt,

4. A. belt calculator for determining belt stretch, comprising a foundation plate7 two circular scales rotatably mounted provided in conjunction with said foundation plate(` said scales adapted to be set in a predeter4 mined relation to one another7 a train of gears for each of the different factors of stretch for belting carried by the foundation plate and associated with the belt Scale, and means for associating the belt' stretch scale with any train of gears so that upon the rotation of the belt scale through an angle indicating a length of belt the belt stretch scale is operated to indicate the belt stretch for the factor for which the train of gears interposed between the scales has been desi ed.

G STAV RICHARD FICKERT. 

